| Cover | Mar. 27, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 27, 2024 |
| Entity File Number | 000-56605 |
| Entity Registrant Name | GOUVERNEUR BANCORP, INC. |
| Entity Central Index Key | 0001978811 |
| Entity Tax Identification Number | 37-2102925 |
| Entity Incorporation, State or Country Code | MD |
| Entity Address, Address Line One | 42 Church Street |
| Entity Address, City or Town | Gouverneur |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 13642 |
| City Area Code | 315 |
| Local Phone Number | 287-2600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | None |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
